66572155 has 16 divisors (see below), whose sum is σ = 86264640. Its totient is φ = 49027968.

The previous prime is 66572141. The next prime is 66572171. The reversal of 66572155 is 55127566.

66572155 is nontrivially palindromic in base 8.

It is a cyclic number.

It is not a de Polignac number, because 66572155 - 2⁵ = 66572123 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27369 + ... + 29701.

It is an arithmetic number, because the mean of its divisors is an integer number (5391540).

Almost surely, 2^66572155 is an apocalyptic number.

66572155 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66572155 is a deficient number, since it is larger than the sum of its proper divisors (19692485).

66572155 is a wasteful number, since it uses less digits than its factorization.

66572155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2790.

The product of its digits is 63000, while the sum is 37.

The square root of 66572155 is about 8159.1761226241. The cubic root of 66572155 is about 405.2884294026.

The spelling of 66572155 in words is "sixty-six million, five hundred seventy-two thousand, one hundred fifty-five".